What is the simplified form of the following expression 6c^2+2.5d-d+2c^2-3d?

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?

A+b= 17, ab=70, find the value of |a-b|

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